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SPEGIFIGATION formingpartof Letters Patent. No. 525,115, dated Augustl 28,' N594E Apn'llcation filed December 23, l. 893.- Seriel No. 494,571.. (No model.)

To all zohom oma-zy concern:

- Be it known that I, FRANCIS H. RrcHARDs, a citizen of the United States, residing-at Hartford, in the county of Hartford and State of Connecticut, have invented certainnew and useful 4Improvements in Boring-'l`ools, of

which the following is a specification.

This invention relates to boring-toolsifr lathes; the object of the invention being to furnish a boring-tool adapted lfor inishing relatively small 'bores in metal work, and to provide, in connection therewith, an improved cnttingetool or bit which may be readily sharpened and ire-sharpened successively and indefinitely, as'it becomes worn, without reshaping said bit; to thereby enable the cutting-tool or bit to be used nearly its entire length; also'to provide means whereby the cutting-tool or bit may be adjustably fixed and properly set for operation.. in the tool-V body or holder, irrespective of its length; and

' whereby said cutting-tool may be quickly and readily removed and replaced and 'ad jnsted laterally at its cutting-end-with relation to the axis of the bore being-finished, to provide for the difderent .degrees of relief required for finishing bores'of varying diamoters, as will be hereinafter fully explained.-

In thedrawings accompanyingand forming a part oi this specification, Figure l is a side elevation, partially'in vertical longitudinal section of a bringftool embodying my' invention.4 Fig. 2 is a plan vieri',I partially in horizontal cross-section, of said boring-tooL Fig. 3 is a frontelevation' of the same. Fig. 4C is a side View of the cutting-tool, or bit, having a cutting-lip at one end; `and Fig. 5 is a side view or' the cutting-tool having a cutting-lip" 'at both ends.

Similar characters designate like parts'in all the iignres. Myvimproved boringetool comprises essen- '.-ftiallyatoohbody or holder, design.ated` in a general way by B, and adapted to be supported in the usual toolfpost A; a cutting-tool or bit, C, and a cuttingtool-adj usting devic`e consisting essentially of a thrust-rod,D, and anadjusting-sorew, E; thel construction and organization of which elements will be hereinafter fully described.

' The tool-post A is or may. heef any suitable construction adapted for snpiicrting the tool-holder and holding` the same up tothe -Work to be operated upon.

1i The tool-body, or cutting-tool holder, inthe-l preferred form thereof herein shown, consists. 'o'f the cylindrical bit-carrying portion 2, preferably conically tapered at its extreme vforward end asshown at 3, and asuitable body# portionfi, (usually rectanglilar in section) shown clamped in the oolpost by means of thecl'anipscrew 5. This tool-holder is bored, longitudinally, and preferably centrally with relation toits width, from end to end, to receive a thrust-rod, l?, of small diameter, which is tted for free longitudinal movement in said bore. The rear end oi said tool-body has an enlarged bore, 6, formed' therein, in

alignment with the thrust-rod-receiving bore,

' which enlarged bore is tapped to receive anadjusting-screw, E, adapted to bear at its 'rear end against the rear end of the thrust-` rod, as clearly shown in Fis. l of medicare*A ings.

rying portion 2 of the toollbody B, is a' spi- Formed'in the forward endv of the bit-can I rally-grooved bore, or cuttingtoolreceiving` to correspond with and iit the Spiral' groove in the bore 7. Y

""rnisineingt001,br on o; eiiilprefembiy be constructed from a cylindrical'rod or-bar forged to form a cylindrical body-portion of -sulniinlntielly uniform diameter fromend to end, having upon its periphery a spiral VHarige or rib 8, which extends from end to end'thereof' and terminates at one or both ends in acutting-limer face, 9, transverse' to said flange,

l asclearly shown in Figs'fl andl 5 of the drawin gs. This flange Will beef such construction'f and of such pitch-esto preolude,. vvhenthe same issupperted in lits-holder, anypossibil ityk oi displacement by longitudinelor end pressure, but on the centrary wi ll .n1fore 85 bit C, which'is sp'irally'ilan'ged as shown at 8,

'rmly secured in-place in its holder if sub? jected t pressure a't either end thereof.. Asl

shown in the drawings, the angle of this spiral flange 8 is very slight, thus enabling it `to have a firm bearing in the plane of its axis within the spiral groove' in the tool-holder; said flange constitutes a retaining and cuttin g-lip-forming flange for the tool. The cut` ting-tool, or bit C, will be symmetrical insection vits entire length to thereby' permit the .same to be ground oli at one or both ends thereof for forming the`c`utting 4face 9, which 5 cutting face 'lies in a plane transverse to the flange 8. The peripheres of the body-por-v tion pf the cutting-tool and the spiral flange are concentric with relation to each other and Y with relation to the axis of said tool, as'will be ,fully understood and 5 of the drawings;

4 zo By the construction of cutting-tool-holder b'y reference to Figs. 4

and cutting-tool hereinbefore' described, it

4 of whichis therebyadapted for use.

-nal displacement ofthe cutting-tool will ber seen that the said holder and cutting- 4 m01 have-coinciding and intermeshingspiral flanges, the abuttingfa'ces of which act one 4 upon the other to bind and prevent longitudiwhen subjected to endwise pressure;

4 In Fig.5 1 have shown a reversible cutting- -bit in which the spiral rib terminates in a cutting-face at both ends of the bit, either end In some cases, a bit of this' construction is advantacutting-tool and cutting-tool holder, the cut-4 ting-tool may be quicklyadjusted by screw-` geons, as it enables the tool to be reversed,

in its holderand the opposite end used when oneend becomes worn,withont the necessity of providing a new bit. v l

4 By means of the described construction of ing the same into or out of the bore 7 of the holder, to bring its cutting-end into proper position to project more or less as may be required to bring the cutting-edge of the bit a greater or lesser distance beyond the outer face of the 4holder` 'and secure the requisite degree of relief `according to the diameter of the borebeingfinished. As a rneansfor adjustablyholding in place the bit or cuttingtool, and for preventing longitudinal as well as rotary movement thereof, I have provided a thrust-rod, D, capable of longitudinal movement in the holder, which thrust-rod bears at its forwardend against the rear end of the bit', and at its rear end against the forward' end of the adj usting-screw, E, screwed into the rear end of the holder, as shown in Fig. 1. When it is desired to adjust the bit, itis sim- Vply necessary to release -the screw E from binding contact with the thrust-rod, rotate.

the bit to move it outward or inward as`del sired, shift the thrustrod forward or backward until-its forward end contacts with the bit, and then screw in the set-screw E until the thrust-rod is tightly impinged between the ends of the bit and set-screw, when the tool is ready for operation. m

To illustrate the operative relationof'the cutting-tool to a piece of work,I have shown,

in Fig. 2, a piece of work,10(representedby' dotted 1ines,) with a bore,.11, being finished. for enlarged by the cutting-tool.4 Insaid figlure it will be noticed that-the cutting-tool is set yin .its holder at an inclination to the axis of the bore being finished, and that4.the cut-4 Havingl thusdescribedmy invention, I`l

claim- 4 4 4 4 1. The herein-described boring tool, it consisti'ng of the longitudinally-recessed cutting- By this arrangetool-holder having the cutting-tool-receiving 4 socket at onev end thereof, with the inwardly projecting' spiral toolbinding rib or :llangeV adapted for engaging the spiral flange of, the

c uttin g-tool, a cu ttin g-tool adj ustably-secured in said socket and having'aombin retain.-

ing and lip-forming flange extending -spirally4 from end to end thereof in engagement-with the 'spiral flange of the tool-holder and terminatig at one or both endsin a-cuttin'g-lip 1 transverse to said flange, and an adj listing-device located in the recessrof thetool-holder and bearing at one end against the `end of said cutting-tool, substantially as described and forthe `purpose set forth.

2, The herein-described'cutting-tool, or bit, it consisting ofv a cylindrical body-portion of substantially unifm diameter from end to end and having upon its periphery the combined retainingfand lip-forming rib or flange extending spirally from end to 'end'of the body-portion and terminating at one or both' IIO y ends in the cutting-lip having its face transf verse to said rib, substantially as described. 3. The herein-described cutting-tool, or'bit,

uniform diameter from end to end and having upon its periphery a combined retaining it ,consisting of a cylindrical body-portion of and lip-forming rib or flange extending spi-v rally fromend 'to end thereof and terminating at its opposite ends inoppositely-disposed cutting-lips whose faces are in parallel planes transverse to the said rib tially as described.

orilange, substan- 4. In a boring-tool of the class specified, the V bit-holder bored longitudinally and lhaving a spirally grooved bit receiving socket formed lin one end thereof at an inclination to the axis of saidholder, in 'combination with a spirally flanged cutting-tool adj ustably fixed in said socket, a thrust-rod adjustably carried in the bit-holder Aand bearingat 'one end against the inner end of. lthe bit,`and 4means for moving said rod longitudinally and securing the same'in its adjustedpositiomsubstantially as ldescribed and for the-purpose set fort t 5. Ina boring-'tool of the classspecified, the 5 combination with the bit-holder bored longitudinally and .having a spi'rally grooved bitreceiving socket formed in one end thereoiA of-'a bit having a cylindrical body-portionI of nniform'diameter from end to end and hav'- ing upon the periphery cf saidbody-portion a combined retaining and lip-forming flange vextending spirallyfromend to end thereof and terminating at one or both ends .in a transverse cutting-lip or face, and an adjust- 15 ing device adapted vfor engagement,with said r bit andoperable from theopposite end'of the tool-holder, substantiallyv as described and for the purpose set forth.

6. The herein-described boring-tool, coinprsing the longitudinally-bored cutting-tool holder having the spirally-grooved toolre ceiving socket 7 at one end thereof and the screw-threaded holel at the opposite end of said holder; the-spirally-ribbed cutting-tool adj ustably seated in said socket, a longitudinally-adjustable thrust-rod bearing against said tool, and the adj ustingscrew bearing against the .opposite end of the thrustrod,l substantially as described and for the purpose setforth. i

7. In aboring-tool of the class speciedgthe combination of the cutting-tool holderB bored longitudinally from end to end and having the lspirally-grooved tool-socket formed in one end ting-tool vhaving thecontinujous spiral ribpterthereof ab an inclination to its face, the cutlongitudinal .movement` in the bore ofthe' f I holder and'bearing atene end againstthe clitv 4o' ting-tool;4 andthe adj ustiug screw screwed. y into the rearend'of the holder and adapted tobear against the thrust-rod, substantially v. as and for the purpose set forthi l f '8. "Inaborug-tool of the class specified', the 4 5 "longitudinally-recessed cutting-tool holder'B havingthe spirally-grooved inclined cuttingtool-receivin g socket at on elendthereof @which socket is cross-'section ally `symr`netricalfrom f end to end); in combination'with a Cutting-tool '5o seated in said socket and liavinga-continuous spiral flange' of uniformy diameter from end to 'end which terminates' at one or both ends in a transverse cutting-lip, and an adj listing-device adapted fore'ngagerne'nt 'with v said cuttingstool and operable from the opporsiteend of the tool-holder, substantially 'as deseribed'and for the purpose set forth. 9. The herein-described boringtoohit consisting of a longitudinally recessed cuttingtool-holder having an, inwardly projecting spiral cutting-tool-binding flange, 'and a cut-J tin g-,tool having a spiral combined retaining and' lip-forming flange in intermeshing en-- gagement with the inwardly projecting bind ing-ilange of the tool-holder and terminating lat' one or both ends in a cutting-lip havingitsl face transverse to said liange and longitudi nal to the axis of 4the'euttix'ig-tool, substan- -tially as described.

' 'FRAN-CIS ;H." RICItlARDSi,I Witnesses;

FRED. J. DOLE, N E. C. WHITNEY. p

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